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using System;
 
public class Test
{
 
	class SomeClass {
	}
	interface IInterface<T> where T : SomeClass {
        void InterfaceMethod();
    }
    abstract class InterfaceImpl<T> : IInterface<T> {
    	public abstract void InterfaceMethod();
    }
 
	public static void Main()
	{
		// your code goes here
	}
}

prog.cs(11,20): error CS0314: The type `T' cannot be used as type parameter `T' in the generic type or method `Test.IInterface<T>'. There is no boxing or type parameter conversion from `T' to `Test.SomeClass'
prog.cs(8,23): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty